[Burr-Brown Corporation ] RCV420JP 
D/C : 04+ 
25,000원
[Texas Instruments ] RCV420KP 
4-20mA Prec. Current Loop Receiver 16-Dip 
17,580원
Texas Instruments ] RCV420JP 
4-20mA Prec. Current Loop Receiver 16-Dip 
11,730원
http://www.icbank.com/shop/search/default.asp?SearchKeyWord=RCV420&rfq_type=5
 
 
RCV420: Single Chip Precision 4-20mA Current Loop Receiver 
At full scale, the circuit cause only a 1.5V drop by its internal sense resistance, which is useful in loops containing extra instrument burdens or in intrinsically safe applications where transmitter compliance voltage is at a premium. The 10V reference provides a precise 10V output with a typical drift of 5ppm/°C, might be very useful for analog-to-digital conversion of the output. [Circuit's schematic diagram source: Texas Instruments Application Notes]
http://freecircuitdiagram.com/2008/10/23/rcv420-single-chip-precision-4-20ma-current-loop-receiver/
 
  
http://www.dzjs.net/html/zonghejishu/2007/0925/2620.html
 
 
4-20mA to Voltage Circuit 
Isolate 4-20mA to Voltage Circuit
Picture shows an isolator receiver that translates a 4-20 mA
process current signal into a 0 V to 10 V output. A 1 V to 5 V
signal appears at the isolator’s output, and a –1 V reference
applied to output LO provides the necessary level shift
(in multichannel applications, the reference can be shared by
all channels). This technique is often useful for getting offset
with a follower-type output buffer.


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Two ICs Convert 4-20mA Signal to 0-5V Output

The circuit in Figure 1 monitors loop current with a current-sense
amplifier (IC1), and employs a comparator/reference/op-amp
device (IC2) to generate a ground-referenced output that ranges
from 0V at 4mA to 5V at the full-scale loop current (20mA).
For the resistor values shown (R2-R6), IC1 produces an
output at pin 8 of approximately 1.25V at 4mA, and 6.25V at
20mA. In turn, the IC2 op amp (configured as a unity-gain
difference amplifier) generates an output range of 0.05V to
5.045V. The IC2 comparator can be used to monitor input
voltage or flag a pre-set loop current.



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http://circuitelec.blogspot.com/2009/03/4-20ma-to-voltage-circuit.html
 
 
4-20mA to 0-5V configuration 
Hello.
I'm starting a new project that has one 4-20mA output from a sensor. 4mA corresponds to one decimal value and 20mA corresponds to another decimal value. If for example my output it´s 8mA i have to know to what value is it... My problem it´s not that... My problem it's to do the best precision I-V conversion. I thought to use a simple configuration with the ampop with a 250 resistor, but i saw this 4-20mA to 0-5V configuration (more complicated) attatched.
I want to know your opinion about what configuration shoud i use or you have a better one? 
 Attached Images  
http://www.picbasic.co.uk/forum/showthread.php?t=2309&page=1